CN102239494B - Apparatus and method for dispersive fourier-transform imaging - Google Patents

Apparatus and method for dispersive fourier-transform imaging Download PDF

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Publication number
CN102239494B
CN102239494B CN200980131718.1A CN200980131718A CN102239494B CN 102239494 B CN102239494 B CN 102239494B CN 200980131718 A CN200980131718 A CN 200980131718A CN 102239494 B CN102239494 B CN 102239494B
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equipment
target
transform
optical
bar code
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CN102239494A (en
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合田圭介
巴赫拉姆·贾拉利
谢坚文
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University of California
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University of California
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/22—Character recognition characterised by the type of writing
    • G06V30/224—Character recognition characterised by the type of writing of printed characters having additional code marks or containing code marks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10712—Fixed beam scanning
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light

Abstract

Provided are a barcode reading apparatus and method in which the spectrum of a probe light is first fourier-transformed into space, directed upon a barcode, and then fourier-transformed converting the spectrally encoded barcode pattern to a time domain waveform. In one implementation, the fourier transformation from the spectrum domain into a spatial domain is performed by a dispersive element, while the fourier transformation from the spectrally encoded barcode pattern to a time domain waveform is performed by group-velocity dispersion (GVD). The temporally encoded barcode pattern is detected by a photodetector, digitized by a digitizer, and analyzed by a digital signal processor. The invention is applicable to a number of fields which involve the reading of one and two dimensional barcodes, displacement sensing, surface measurements, measurement of width and gap, flow cytometry, reading of optical media, presence or absence detection, and other related fields.

Description

For equipment and the method for dispersive fourier-transform imaging
The cross reference of related application
The right of priority of the sequence number that the application requires to submit on July 24th, 2008 U.S. Provisional Application that is 61/083,255, and mode is by reference herein incorporated its entirety.
The research of sponsoring about federal government or the statement of development
The present invention uses the government's grant that Ministry of National Defence authorizes support No.N66001-07-1-2007 and produce.Government has the specific rights in the present invention.
It is inapplicable that mode by reference merges the material of submitting to the form of compact disk
The bulletin of material material protected by copyright
According to the Copyright Law of the U.S. and other countries, the part material in this patent document is protected by copyright.Copyright owner does not oppose the facsimile reproduction of any patent document or patent disclosure, and this is that still, copyright owner retains all copyrights in addition because this material protected by copyright has appeared in the disclosed file available of United States Patent (USP) trademark office or record.Therefore, copyright owner does not abandon any this patent document being used as to secret right, is included in not according to " code of Federal Regulation " the 37th volume, and the 1.14th article is limited in the situation of its right.
Technical field
The present invention relates generally to optical imagery, more specifically, relates to the high speed optical imaging that uses dispersive fourier-transform imaging.
Background technology
Bar code is the machine readable binary representation that is usually expressed as the information of for example, a series of low reflection bar (for example, dark color or black bar) in high reflecting background (, light color or white background).The difference measured (for example, dark bars is than the reflectivity of light bar) of these optical property is converted into binary representation.For example, according to decoding software, make dark bars corresponding to 0, the white interval between dark bars is corresponding to 1, or vice versa.Can carry out bar code reading by the optical scanner that is called as bar code reader, in the time that detection bundle incides black bar or white interval, bar code reader is measured the optical reflection from black bar or white interval.
Due to the introducing at black bar or white interval, bar code has become in label and stock control necessary.Some modern Application of bar code comprise: (a) Product labelling and automatically detection; (b) ticketing service and licence; (c) mobile and flow, such as mail, parcel, aviation luggage, hire a car and nuke rubbish; (d) file management, comprises imaging, filing and index; (e) blood bank information system; (f) tracking in honeybee research; (g) collect mailbag information and it is followed the tracks of from many network source.Those of ordinary skill in the art will recognize, the application of bar code has been prevalent in our modern society.
Bar code reader is the necessary parts of barcode technology.Traditional reader comprises scanner, demoder (internal or external) and is used for connecting the cable of reader and the treating apparatus (for example, computing machine) for digital signal is processed.Bar code reader is the electrooptical device of for example measuring, from the optical reflection of bar code (, being made up of non-reflective black bar and reflective white interval).In market, can obtain dissimilar bar code reader, they use slightly diverse ways bar code to be read and decode.Bar code can be to use the one dimension that bar and line drawing are painted to change, or can be that the two dimension that uses other little space constraint symbols that comprise in point or the two-dimensional field to describe changes.
A kind of form of bar code reader is pen type reader, and (continuous-wave) light source of continuous wave in pen type reader and photodiode receiver are mutually contiguous, such as the top at pen or rod.For bar code reading, make the top of pen move leap bar in the mode of steady motion.Detect in response to being exposed at each the photodiode that the mobile incident light time carries out the change of the luminous power being reflected back from it, generate the bar that represents in bar code and the voltage waveform of intermittent pattern.The waveform that photodiode detects is decoded in the mode that is similar to decoding Morse code signal (Morse code dots and dashes) by scanner.
The another kind of form of bar code reader is laser scanner, and except adopting reciprocal mirror (reciprocating mirror) or rotating prism to scan the laser beam of repeatedly crossing bar code, its work and pen type reader are very similar.As pen type reader, measure the power of the light being reflected back from bar code with photodiode.At pen type reader and laser scanner, in the two, the light that reader sends is all adjusted to specific wavelength, and photodiode is all designed to only detect the light of this wavelength.
The another kind of form of reader is CCD reader, wherein charge-coupled image sensor (CCD) reader or alternatively CMOS active pixel reader utilize the photosensor array being in line in reader head.CCD reader is measured the light from bar code reflection, generates the voltage pattern identical with pattern in bar code by measuring the voltage at each sensor two ends in a described line sensor.An important difference between CCD reader and pen type or laser scanner is, the surround lighting that the measurement of CCD reader is reflected from bar code, and pen type or laser scanner are measured the reflected light of the specific wavelength that is derived from scanner itself.
The another kind of form of reader is the reader based on video camera, and wherein video camera is caught the two dimensional image of bar code.Although technical they can read the bar code of any type, be especially applicable to for reading two-dimensional bar code.For example it should be understood that, for given geometric resolution (, the line based on the thinnest or pixel separation), the information density of two-dimensional bar code can be considerably beyond the information density of only crossing over the bar code that single direction scans.For instance, catch the image of bar code by small ccd or cmos camera imager, and use digital image processing techniques to decode to it.
Although bar code reader is to following the tracks of a large amount of article of great use,, for example, in the time that needs are followed the tracks of the article of quite a large amount of (, approximately millions of), traditional barcode technology is processed and aspect speed, is had its restriction because it reads slowly and decodes.Traditional bar code reader has the sweep speed of about hundreds of per second time scanning.Even the fastest bar code reader also only limits to the sweep speed of approximately 1,000 scannings per second.The speed restriction of scanner is mainly to cross bar code source light is scanned to needed response, and in imaging reader, the rate limit of picture frame scanning times per second.
The speed restriction that combines traditional bar code reader of conventional digital signal processing has stoped people to follow the tracks of suitable large numbers of items, especially in the application that comprises field of bioinformatics, in field of bioinformatics, originally just need to manage large numbers of items, such as blood bank, stem cell bank, sperm bank and DNA sequence dna storehouse.
For example, barcode technology is at present for allowing safety to contribute the blood bank information system of blood and blood transfusion service (comprise collection, processing, storage and be provided for the human blood of blood transfusion).The blood transfusion of mistake blood constituent is the modal matters of aggravation relevant with blood transfusion.Cause that the fault of these events is normally because the error identification to sample.The acceleration of Facing Globalization, the extremely a large amount of blood sample of tracing and managing is very crucial.For example, but in order to carry out suitable mark, barcode technology needs a considerable number of information to encode, and comprises patient's hospital's numbering, surname, name, date of birth, sex, blood group etc.To so many information need to requirement have been proposed to the speed of current scanner, when especially working as surveyed bar code and must comparing with large database.This just means and need between sweep velocity and accuracy, trade off.
Therefore, need to be in the case of without making light cross the article that will scan with less time bar code reading and carry out the system and method for displacement sensing.These and other need to be met in the present invention, and the present invention has overcome the scanning system of former exploitation and the defect of method.
Summary of the invention
The invention provides a kind of equipment and method, described equipment and method are used in response to reading this target to sensing target or from the light beam execution dispersive fourier-transform of target.Described target can comprise the coding of arbitrary form or the target of not encoding (comprising various forms of bar codes) and uncoded solid, liquid and/or gas sample.For simplicity, term " target " is used for representing to collect arbitrary target or the sample of the information relevant with it in response to the reflectivity to the light beam that points to this target or transmissivity at this.
Although the present invention is applicable to wide in range detection, measures and read application,, the present invention is particularly suitable for relating to bar code and reads the application of reading with the bar code of relevant matches.Operation of the present invention is the detection based on utilize respectively the optical spectrum encoded of bar code and decoding in spatial domain and time domain conventionally, thereby allows in one second, tens million of samples (for example, bar code) to be read and the detection of database relevant matches.This is than fast nearly four orders of magnitude of traditional bar code reader.The present invention also utilizes the photoresponse to crossing over one or more dimensions space to detect and/or measure to provide high-speed displacement sensing.
For simplicity, the present invention mainly discusses the reading of bar code sample, and wherein in bar code sample, the size of adjacent strip is determined, thereby can decode to generate alphanumeric information to their coding.These bar codes can comprise the light activated any bar-code structure of light beam detection described herein.For example, described can comprise the material of different colours, reflectivity, or has surveying the light activated reflectivity of bundle.Alternatively or additionally, described can for example have displacement in response to structure depression or that protrude.
In order to simplify discussion, the present invention discusses " reading " of sample, and no matter what is decoded, detected and/or measures, and be not limited to the sample (such as the situation of bar code) that comprises coded message.To coded samples not " reading " be considered mean the character to sample (comprising: the having or not of composition, size, shape, roughness, direction, flow and sample in can be according to any related properties of determining from the detection bundle of described sample reflection) determine.Alternatively, the present invention can be arranged in response to the light transmission level through sample and read sample, wherein can distinguish by transmitted light instead of reflected light the different qualities of sample.In addition,, if expect other information, reflection and the transmissivity that the present invention can be embodied as sample are carried out independent detection.The technology that the present invention instructs also can be for analyzing the phase place of transparent substance by detecting interferingly transmitted light.
The present invention relates generally to optical imagery, be particularly useful for bar code to carry out high-speed displacement sensing and read, carry out for reference database the detection of relevant matches, and more specifically, relate to a kind of for respectively in spatial domain and time domain based on the optical spectrum encoded of one dimension or two-dimensional bar code being carried out to equipment and the method that dispersive fourier-transform imaging is relevant with optical data storehouse with decoding, comprise making sample to be exposed to wideband pulse bundle and to being preferably converted into the Light-Echo detection of time domain waveform of digital signal.
Described method makes bar code be exposed to the wideband pulse photodetection bundle of the spatial dispersion by diffraction grating, to make the light of each individual wavelengths incide the different piece of bar code along the transverse line in bar code.Bar code information is encoded into catoptrical spectrum.Reflected light from bar code turns back to diffraction grating, and the component that diffraction grating disperses spectrum is recombinated.Then, use group velocity dispersion (GVD) to come folded light beam to carry out Fourier transform, and detect this reflected light by single pixel light photodetector.During carrying out Fourier transform, can implement inner amplification with raising signal to noise ratio (S/N ratio) arbitrarily, thereby improve detection sensitivity.Also homodyne detection can be carried out and/or balance detection is improved signal to noise ratio (S/N ratio).
In a preferred embodiment, photoelectric detector is converted to light signal can be exaggerated and digitized electronic signal.Dispersive fourier-transform and photoelectric detector are mapped as spectrum (optical spectrum encoded bar code information) electronics time domain waveform and have represented full-electronic spectralyzer in combination.Therefore, embodiments of the invention have been eliminated for example, needs to traditional optical spectrometer (, diffraction grating and array detector), and high detection sensitivity is provided, and especially connecting inner amplifies.
It should be understood that and can another kind of dispersion element used according to the invention come in vertical direction surveying the further dispersion of Shu Jinhang, thereby the mode that light beam spectrum is carried out raster scanning with beam frequencies is crossed over two dimensional surface.Another kind method is, when perpendicular to survey bundle via the direction of the horizontal line of diffraction grating incident on when scanning probe bundle, can obtain the two dimensional image of bar code, be for example used for using in the process that reads two-dimensional bar code.The technology herein that should also be understood that can be extended to three-dimensional.In one embodiment, the second two-dimensional detection bundle can point to sample from orthogonal directions, and catches and process light reflection and/or transmission according to the present invention, so that reading and analyzing sample to be provided in three-dimensional.
The present invention also allows to utilize the large database that be made up of up to a million bar codes to the relevant matches detection that optionally exceeds the speed limit of measured bar code.If before electrooptic modulator is placed on photoelectric detector, realize relevant matches detection.The amplitude of the bar code of surveying is modulated by the conjugation of known bar pattern in database.If in measured bar code matching database one, institute's detection signal shows a relevant peaks.Compare from other patterns in measuring-signal and the database of laser pulse subsequently, until identify correct pattern.Before light beam is modulated, use pattern maker or digital to analog converter that database pattern is converted to conjugate time sequence.Certainly the pattern of, database being modulated must be synchronizeed with the measured pattern of introducing.After this, carry out with the pulse recurrence rate of laser the scanning that relevant matches is detected.Obviously, the use that relevant matches detects is optional, and this is because dispersive fourier-transform scanner can use in the situation that not having relevant matches to detect.
It is known with diffraction grating, spectrum being mapped to space.When the light of space diffraction is from object reflex time, the pattern of reflectivity of object is encoded on spectrum.The mapping of spectrum is for medical imaging, uses charge-coupled image sensor (CCD) the optical spectrum encoded spatial information of decoding in medical imaging.
An important aspect of the present invention is to utilize dispersive fourier-transform that spatial information (being encoded on spectrum) is mapped as to time-domain signal, and utilizes this technology to carry out bar code reading.Dispersive fourier-transform has been applied to the measurement of the light pulse spectrum aspect absorption spectroscopy and Raman spectroscopy, reflection method and light coherence tomography method.Use dispersive fourier-transform measure spectrum to eliminate the needs to diffraction grating and detector array.These elements are replaced by dispersive optical fiber, single photodetector and digitizer.This has simplified system, and more importantly, makes it possible to carry out real-time bar code fast and catch.
What the major limitation of dispersive fourier-transform and the present invention overcame is the loss in dispersive medium.Less desirable absorption or scattering that this loss occurs can pass dispersion element by light time cause.Also has one by the described prior root of the close ties between dispersion and the loss of kramers-Kronig relation (Kramers-Kronig relation).Be independent of this root, described loss has limited the detection sensitivity of system.This can be by recognizing that following aspect understands, that is, and and by means of the conversion of spectrum-time, spectral resolution (thereby, the pixel count of barcode scanner) determined by the temporal resolution of electricity detecting system.In other words, the electric bandwidth of digitizer (electrical bandwidth) has limited spectral resolution, Δ λ=0.35/ (Df dig) provide this relation, wherein Δ λ is spectral resolution, D is total group velocity dispersion, f digfor the input bandwidth of real-time electronic digitizer.Product Δ λ D is definite by the bandwidth of digitizer, thereby, in order to increase spectral resolution (that is, increasing pixel count), have to increase total group velocity dispersion D.
But the increase of this spectral resolution realizes as cost to increase light loss and to reduce detection sensitivity.Therefore, in the time expecting high detection sensitivity and high spectral resolution, problem centered by the loss in dispersion element.Because barcode space information is encoded on spectrum, therefore the loss of dispersion element has applied restriction to pixel count and detection sensitivity.Sensitivity can improve by the long signal of use integral time, but this has limited the reading speed of bar code.Therefore, the loss in dispersion element makes to have produced between detection sensitivity, pixel count and sweep velocity compromise.Increasing laser power is not desirable solution, because it can cause less desirable nonlinear properties distortion.
The present invention relies in dispersion element and overcomes the compromise of sensitivity, pixel count and sweep velocity with inner amplification.Above-mentioned compromise by the loss in dispersion element is compensated to overcome.In order to make optimized performance, in dispersive optical fiber, carry out and amplify, to increase the signal intensity being reflected back from bar code.Inside in dispersion element is amplified previously about real-time Raman spectroscopy and absorption spectroscopy and femtosecond digital and is proved in our laboratory.This amplification is applied to optimizes one or more barcode scanner embodiment in the present invention.
The desired character of dispersion element is level and smooth dispersion and the commercial applicability in high total dispersion, low-loss, large optical bandwidth, described bandwidth.Although there are other selections such as chirped fiber grating (CFBG), the dispersive optical fiber such as dispersion compensating fiber (DCF) provides the optimum combination of these parameters.Although CFBG is compacter than DCF, the latter also can be used as raman amplifier loss is compensated.Described loss can also for example, compensate by discrete optical amplifier (, Erbium-Doped Fiber Amplifier or even semi-conductor optical amplifier).Distributed raman amplification in common first-selected dispersive optical fiber is because it has kept relatively constant signal level in whole Fourier transform process.This relatively constant signal level is important, because it is by making signal power away from low-power (being full of noise) and high power (nonlinear) state, signal diode be maximized.
Raman amplifies, and in the time for example, using in amorphous state medium (glass), it is broadband that Raman amplifies nature.Can carry out this gain spectral of further cutting by use multi-wavelength pumping laser, and unexpectedly, use noncoherent pump source can realize very wide band gain spectral.This is very desirable, causes large horizontal bar code sensing range because large light belt is wide.The dispersion element that Raman amplifies can also be eliminated the needs to high-powered sources, and high-powered sources can cause less desirable nonlinear properties distortion potentially.
The present invention stands the inspection of implementing in many ways, includes but not limited to following description.
One embodiment of the present of invention are that it comprises for the equipment of bar code reading and sensed displacement: the device of (a) surveying bundle for generating wideband pulse; (b) for the response light signal of the target based on reading, the spectrum of pulse detection bundle is mapped to the device of the spatial domain of the target that sensing will read; (c) for response light signal being carried out to the device of dispersive fourier-transform, so that this response light signal is converted to time domain waveform; And (d) for detection of with analyze the device of time domain waveform, to determine the bar pattern and/or the displacement that are read in target.
In an embodiment of the present invention, can be in response to reflexing to from target for the luminous energy of the device of dispersive fourier-transform or in response to generating response light signal by object transmission to the luminous energy of the device for dispersive fourier-transform.In addition, can implement to combine embodiment, its based on reflection and transmitted light the two read the information about sample.
Described equipment may be implemented as and makes by free air, optical fiber (or other optical transmission structures) or transmitted and comprised the light beam of surveying bundle and response light signal by the combination of free air and optical fiber.
The order that alternatively, can spectrum be mapped to space (spatial dispersion) and dispersive fourier-transform (time dispersive) by change realizes described equipment.
In at least one embodiment, comprise for the device that generates wideband pulse detection bundle the laser instrument that is configured to production burst.In a kind of pattern of the present invention, comprise alternatively pulse collection element, so that the device that gathers selected pulse a series of pulses from being generated by pulsed laser (or similar source) to be provided.Pulsed beams are surveyed and can be comprised or be improved in response to for amplifying and/or the option means of filtering, thereby improve signal to noise ratio (S/N ratio) and the detection sensitivity of described equipment.Similarly, amplification and/or filtering can be applied to the response light signal (for example, reflection and/or transmitted light) receiving from sample alternatively.The unrestriced mode by example, optical amplifier can be carried out with stimulated Raman scattering, semi-conductor amplifier or fiber amplifier.Further, before fiber amplifier can be disposed in the device for dispersive fourier-transform, or afterwards, and continuously the glistening light of waves or pulsed light can carry out pumping to described fiber amplifier.Another optional element is the device generating for super continuous spectrums, and its spectral bandwidth for the light that makes to send from light source broadens, and it can be contained in described light source or is implemented as independent selectable unit.
In at least one embodiment, comprise dispersion element for the device that spectrum is mapped to spatial domain, the like of wavelength of bundle is surveyed in the phased array dispersor of for example diffraction grating, prism, virtual image or the wideband pulse that can distinguish introducing.
In at least one is realized, for example, in the time detecting and the energy of reflection light of a part of the path same paths of light is surveyed in incident, comprise the option means for separating of light beam.
In at least one embodiment, be used for causing the element (for example dispersion element) of group velocity dispersion (GVD) and/or be arranged in the process that response light signal is converted to time domain waveform for the device of dispersive fourier-transform and cause that response light signal is converted to time domain waveform by the optical element of warbling of group velocity dispersion (GVD).
In at least one embodiment, for detection of with analyze any other devices that the device of time domain waveform utilizes at least one for example, light activated element such as photosensitive semiconductor device (, photodiode, phototransistor etc.) and so on or its electrical characteristics to change in response to the change of the characteristic of the light receiving and detect incident light.Detecting device is changed incident light, preferably simulating signal is changed into digital signal with simplify process digitizer in change.But, it should be understood that in the situation that first these simulating signals not being converted to digital signal, in response to the direct processing to these simulating signals, at least can read limited information from sample.Signal processor analysis is carried out the electric signal of self-detector, thereby reads and provide the information about other readable aspects of coding, space displacement and sample to sample.Preferably, signal processor comprises one or more processors that dispose for the software of combine digital signal processing.
In at least one embodiment, described equipment is arranged to reading as the target of one dimension or two-dimensional bar code, for example, for the tracking of the automatic sorting of looking for control, conveyer line of the tracking of commodity, the Serial Control of printed circuit board (PCB) (serial control), hard disk drive (HDD) parts, PC media drive, wafer manufacture or any occasion of bar code reading wherein.
In at least one embodiment of the present invention, can read sample with the form of being correlated with, wherein the desired character of the actual characteristic of sample and sample (for example, reading) is carried out to optics comparison from database.Because this aspect of the present invention is the most easily understood about coded samples, therefore bar code will be counted as example and be unrestricted.In a kind of associative mode, (for example use the expectation bar code of sample, among continuous bar code) modulate the response light signal from sample, wherein can easily determine correlativity according to received signal (for example,, in response to threshold process) and without further analysis.In at least one embodiment, can by comprise be arranged in by response light signal be converted to electrooptic modulator before electric signal provide with from database and be applied to the correlativity of the bar pattern of the expectation that the conjugation of this electrooptic modulator receives.Whether there is relevant peaks and comes the relevant matches detection of realize target and database in response to detected response light signal.In at least one pattern of correlativity, pattern maker generates relational pattern for the information based on from database, and described database comprises the information relevant to the goal set that wherein can find current goal.Amplitude modulator is arranged to modulated response light signal, and it is with positive correlation or negative correlation between the relational pattern of the amplitude for modulated response light signal of carrying out display-object for the device that carries out threshold value sensing to having carried out the response light signal of which amplitude modulation and receive from database.
Can utilize embodiments of the invention target to be read in the mode of one dimension or two dimension in response to the light from target (sample) reflection and/or transmitted through the light of target (sample).The present invention can be implemented the target (for example, photosensitive bar code form) for reading coding, and for target is carried out to high-speed displacement sensing.It should be understood that displacement sensing can the shape of record object and the existence of structure, the measurement to rough surface, the measurement to width and gap and material and/or object or element disappearance.The present invention can also utilize displacement sensing for example, to realize flow cytometry (flow cytometry) by the movement and the morphological feature (, size, shape etc.) that detect and/or measure arbitrary form particle in fluid.In other embodiments of the invention, described equipment can be arranged to read the data that used in for example optical storage media (medium having comprised according to formatted, described agreement comprises those agreements that use together with CD, DVD and Blu-ray Disc) carried out optical encoding target.
In at least one embodiment, the target that described equipment is arranged to being selected from the application in application group reads, described application group comprise bioinformatics, medical specimen tracking, follow the tracks of use in stem cell bank, sperm bank, DNA sequence dna storehouse or wherein read any occasion of biological information from the test sample book in equipment.
One embodiment of the present of invention are a kind of equipment, and it comprises: (a) wideband light source, is arranged to production burst and surveys bundle; (b) optical spectrum encoded device, is arranged to the target that pulse detection bundle is transformed into spatial domain and guides its sensing to read; (c) spatial decoder, be arranged to by from target reflection or transmission be transformed into time domain by the light of the spatial domain of target; And (d) signal processor, be arranged to determination and analysis time domain waveform to read the displacement in pattern and/or definite target.
One embodiment of the present of invention are a kind of for reading the method for displacement of pattern and definite target, and it comprises: (a) generate the pulse detection bundle from wideband light source; (b) pulse detection bundle is transformed into spatial domain; (c) target that pulse detection Shu Zhixiang in guide space territory will read; (d) light of the spatial domain from reading target is converted to time domain waveform; And (e) detect and analyze time domain waveform being configured in the processor of carrying out from the programmed instruction of storer, to read the displacement in pattern and/or definite target.
The invention provides many useful aspects, in the situation that not departing from this technology, it can be realized separately also and can realize with the form of any desired combination.
An aspect of of the present present invention is for the equipment from optical target reading information and method.
Another aspect of the present invention provides in response to the first optical signalling guiding of spatial domain being pointed to target and has read target information, the light receiving from target is transformed into time domain, then time domain waveform analysis is read the ability of target information.
Another aspect of the present invention provides with one dimension, two dimension or three-dimensional form information has been read.
Another aspect of the present invention provide in response to from target reflection or transmission combine information read through the detection light of target or its.
Another aspect of the present invention provides coding target has been read, for example, the bar code information from target is read.
Another aspect of the present invention provides the correlativity of target information and database information.
Another aspect of the present invention provides in response to the target correlativity of light signal being modulated and in response time domain waveform, relevant peaks being checked.
Another aspect of the present invention provide to the various codings from target (sample) and not the information of coding form read.
Of the present inventionly be on the one hand the coding target (for example, a peacekeeping two-dimensional bar code) that can be applied to wide region again and collect information about sample equipment and the method for (comprising the information of the existence, displacement, structure, movement etc. of the ingredient based on sample).
In the following part of instructions, will provide other aspects of the present invention, wherein detailed description is in order fully to disclose the preferred embodiments of the present invention, instead of limits the invention.
Brief description of the drawings
By reference to following, only for the accompanying drawing of illustration purpose, invention will be more fully understood:
Fig. 1 is according to the process flow diagram of an embodiment of the method for the execution dispersive fourier-transform albedo measurement of one aspect of the invention.
Fig. 2 is the schematic block diagram of carrying out according to an embodiment of the invention the equipment of one dimension dispersive fourier-transform albedo measurement.
Fig. 3 is the schematic block diagram of carrying out according to an embodiment of the invention the equipment of one dimension dispersive fourier-transform albedo measurement and the detection of database relevant matches.
Fig. 4 is the schematic block diagram of carrying out according to an embodiment of the invention the equipment of two-dimension chromatic dispersion type Fourier transform albedo measurement.
Fig. 5 is the schematic block diagram of carrying out according to an embodiment of the invention the equipment of two-dimension chromatic dispersion type Fourier transform albedo measurement and the detection of database relevant matches.
Fig. 6 is the schematic diagram of an embodiment of the dispersive fourier-transform albedo measurement equipment of Fig. 2 according to an aspect of the present invention, and it shows the detection to piezoelectric transducer (PZT) sample.
Fig. 7 is the orthogonal view of test sample book, by the target of non-bar code, use of the present invention is described, described sample is specially the silicon waveguide of the silicon dioxide protection with two adjacent thin aluminum films.
Fig. 8 be according to one aspect of the invention to the reflection detecting light spectrum from sample and the curve map that compares from the reflected light of the catoptron with for referencial use.
Fig. 9 is according to the curve map of the calibration reflectivity profile of sample shown in Fig. 7 of one aspect of the invention.
Figure 10 is in response to the curve map of the calibration reflectivity profile of the sample in physical translation (movement) Fig. 7 that illustrate, according to an aspect of the present invention that is scanned sample.
Figure 11 is according to the curve map of the spectrum in response to the detection light from sample reflection shown in different amplification stages of one aspect of the invention.
Figure 12 according to one embodiment of the invention illustrate, the dispersive fourier-transform bar code of Fig. 2 reads the schematic diagram of measurement.
Figure 13 be with as be present in shown in the background bar in sample bar code, according to the one-shot of one aspect of the invention (single shot) bar code measure curve map.
Figure 14 according to one embodiment of the invention illustrate, the schematic diagram of the two-dimension chromatic dispersion type Fourier transform albedo measurement of Fig. 4.
Figure 15 is according to the schematic diagram of the dispersive fourier-transform transmissivity measurement shown in one embodiment of the invention.
Embodiment
Accompanying drawing is carried out to more specifically reference below, for illustrative purposes, in the equipment shown in Fig. 1 to Figure 15 summarizes, implement the present invention.It should be understood that in the case of not departing from basic thought disclosed herein, the structure of described equipment and concrete parts thereof can change, and the concrete steps of described method and order can change.
Fig. 1 is the embodiment 10 of the method for dispersive fourier-transform albedo measurement, and it has summarized execution one dimension or two-dimensional bar code reads and optionally carry out relevant matches for given data storehouse and detect necessary step.According to this embodiment, in frame 12, make bar code be exposed to wideband pulse by diffraction grating, the spectrum of spatial dispersion simultaneously incides bar code.In frame 14, the reflected light producing from bar code turns back to the diffraction grating of reformation pulse, and is converted into time domain waveform by dispersive fourier-transform.Then,, in frame 16, can carry out optically optionally and detect for the relevant matches of reference database according to the optical spectrum encoded bar code information of it being modulated by photomodulator being provided by pattern maker.In frame 18, carry out sensed light signal by photoelectric detector, and in time domain, for example analyze the electric signal of this light signal by digital signal processor.
Reference block 12, light source is preferably the super continuous spectrums that points to bar code.It should be understood that the generation of super continuous spectrums can be described to wherein laser is converted to the processing of the light of the spectral bandwidth (for example, having low temporal coherence) with non-constant width conventionally.Conventionally by making light pulse propagation for example, realize spectrum expansion by strong nonlinearity device (, optical fiber).Can be by making the pulse laser with high-peak power produce super continuous spectrums through highly nonlinear optical fiber.Alternatively, can generate light source by the ultrashort wave (USW) pulse laser with large bandwidth, for example, be produced by titanium sapphire laser device.Surveying bundle can be amplified optically and filtering before arriving diffraction grating.
The bandwidth of surveying bundle should be larger, is preferably in some cases large as much as possible, and this is because the resolvable spwort in angle of diffraction scope and the bar code of diffraction grating increases with bandwidth.It is equally large that spectral bandwidth can allow with target and equipment.As long as the continuous impulse of time dispersive is not overlapping in time, just can increase bandwidth.Equally, it should be understood that each parts (for example, photodiode) and optical element to equipment exist restriction.In addition, this is differentiated target best in specifying spectral range, and for example, the target clearly detecting from bar code in visible spectrum may not can present in the time moving to the infrared light part of spectrum.Typically, bandwidth is a scope, and for example the visual 650nm near infrared range is to 1100nm, or in visual range, visual to some similar scope that arrives the scopes such as infrared, near infrared, near ultraviolet ultraviolet (UV) scope, visual.
Incide the detection bundle of diffraction grating by spatial dispersion, the wavelength of surveying bundle is separated.Then, dispersed light is collimated and incide bar code by cylindrical lens or other diffraction grating.Reflected light from bar code turns back to diffraction grating, reformation pulse.
Consider frame 14, optical element by any desired or its (for example combine, dispersion element, the optical element etc. of warbling) cause that (warbling) group velocity dispersion is to carry out Fourier transform, thus be provided for reflected light signal to carry out the device of dispersive fourier-transform.This dispersion element comprises the optical element of the group velocity dispersion that causes reflected light signal.It should be understood that, the reflex response of warbling is the wherein non-constant and response that changes in structure of bragg wavelength, for example for example,, in the optical element of warbling (chirped mirror), the light of different wave length is penetrated in mirror structure to some extent, thereby experiences different group delays.Dispersion element can be optical fiber, body monocrystalline, chirped mirror or chirped fiber Bragg grating.Frequency-region signal is converted to time domain waveform by dispersion in dispersion element.Distribute in time by this way corresponding to the catoptrical formation frequency from bar code of the difference of bar code along transverse line, described mode is to allow to be mapped as time domain waveform from the reflected light of bar code difference.During Fourier transform, when carry out optically pumping dispersion element by broadband light, flashlight can carry out optical amplifier by stimulated Raman scattering.Alternatively, before can maybe the dispersion element of optical amplifier cannot being carried out, can carry out optical amplifier reflected light by raman amplifier or Erbium-Doped Fiber Amplifier (EDFA).
In frame 16, show for making to detect the optical correlation matching with data.It should be understood that its modification allows to carry out a series of coherent detection operations with large database.The sequential barcode signal that has carried out Fourier transform according to frame 14 is modulated by amplitude modulator.For example, in conjugation sequential, provide modulation signal by generation corresponding to the pattern maker of 0,1 sequence (contrary with barcode encoding) of white interval and dark bars, thereby only in the time that modulator has offseted the amplitude of input barcode signal, the transmission of amplitude modulator is just zero, thereby positive correlation detected.
Reference block 18, if detected not necessarily with the relevant matches of reference database, the reflected signal at frame 14 places can directly be detected by photoelectric detector.If need to detect with the relevant matches of reference database, photoelectric detector detects the transmission of amplitude modulator at frame 16 places.The output signal of photoelectric detector is digitized converter digital, and described digitizer is suitably triggered by the pulse train of the detection bundle of certain repetition rate.Only in the time that the signal on digitizer is zero, the bar code that measured bar code and its signal are provided in the database of amplitude modulator matches.The bar code and the correlation detection of measuring bar code in a database carried out in each pulse.In other words, carry out with the repetition rate of laser pulse sequence the correlation detection of measuring bar code and many bar codes.
Fig. 2 shows according to the example embodiment 20 of one dimension dispersive fourier-transform albedo measurement of the present invention.It should be understood that described equipment can be used to high-speed displacement form sensing and the similar application of bar code sensing and wide region.In addition, point to read target light beam (pulse detection bundle), detect and/or measure with and the light signal of reflection for example, by free air, light transmission medium or device (optical fiber) or propagate by its combination.
Conventionally, for generate wideband pulse survey bundle device (for example, wideband pulse detecting laser 22) be connected to the device 32 with the light signal from target reflection for separating of targeted light signal, for example comprise optical circulator, its isolation is from reading the light of target reflection.Selectable unit 24,26 and 28 is below discussed.
For example, for example, in response to using diffraction grating or (making to survey the space dispersive similar one or more optical elements of bundle, the phased array dispersor of prism, virtual image etc.), make survey bundle wavelength dispersion to leap (for example read target, bar code 38) one dimension transverse line or extend on pattern, stream of pulses is transformed into spatial domain by the device 34 that carries out Fourier transform mapping by survey the spectrum of bundle for paired pulses.Alternatively, described system can be arranged to and read, detects and/or measure one dimension or two-dimentional aspect that other targets of different reflectivity are provided according to material character and/or displacement.
For example, aim at or focus on bar code target 38 for making the device 36 (, lens) of pulse detection bundle collimation make to survey bundle.Bar code information by optical spectrum encoded be catoptrical spectrum from bar code 38.Turn back to diffraction grating 34 from the reflected light of bar code 38, reformation pulse.Optical circulator 32 guides reflected light to point to (amplifying type) dispersive fourier-transform device 40, and makes it can not turn back to lasing light emitter 22 to its isolation.Then, by being time domain waveform for the device 40 that reflected light signal is carried out to dispersive fourier-transform by reflected light Fourier transform, so that reflected light signal is converted to time domain waveform.Alternatively, can in dispersive fourier-transform is processed, carry out optical amplifier, thereby compensate processing due to dispersion the inevitable light loss producing.The output of dispersive fourier-transform device 40 is used to determination and analysis time domain waveform and receives with the determination and analysis device of determining the bar pattern that reads in target and/or displacement.This determination and analysis device is shown as including photodetector 42, optional filter 44, optional amplifier 46, digitizer 48, by them, time domain waveform is guided, then by for example, for the device 50 (digital signal processor of, realizing in the mode of any desired) of combine digital signal processing it being analyzed.
It should be understood that in the situation that not departing from technical scope of the present invention, can generate in many ways wideband pulse bundle.For example, the present invention is particularly suitable for using pulse laser.The spectral response of laser can be enhanced in response to operative installations generates super continuous spectrums as required.
In the embodiment shown in Figure 2, if laser pulse repetition rates height like this to such an extent as to continuous impulse are overlapping after through dispersive fourier-transform device 40, can be by reducing pulse train with optional pulse detector 24.In addition, can utilize optional optical amplifier 26 to amplify the light pulse that carrys out self-pulsing laser 22, and for the optional super continuous spectrums maker 28 of pumping.If enough powerful super continuous spectrums that generates of the pulse that is derived from laser instrument 22, can not need optional amplifier 26.Equally, if original pulse has very large bandwidth, amplifier 26 and/or super continuous spectrums maker 28 can be not necessarily.For example, titanium sapphire mode-locked laser can generate the ultrafast pulse (< 10fs) with very large bandwidth (> 100nm).The super continuous spectrums of radiation can be by optional bandpass filter 30.
Photodetector 42 is the photodetector that the photon of the output from (amplifying type) Fourier transform device 40 can be converted to electric signal alternatively.Photodetector 42 can be photodiode, avalanche photodetector or be configured for the similar device that light signal is converted to electric signal.Can carry out filtering to limit its bandwidth to the electric signal from photodetector 42, for example, utilize optional electronic filter 44 and amplify described signal by electron-amplifier 46 alternatively.It should be understood that only bandwidth need be restricted to restriction is downwards incorporated into the noise in analog to digital conversion subsequently.Then, can carry out digitizing to signal by digitizer 48.Also can with digital signal processor 50 or computing machine be processed or analytic signal, and it is shown and is stored.
Can find out, described equipment and method can be in rationally detecting band realizations on a large scale.For example, can be operated in 1300 and 1600nm between telecommunication laser or the amplifier direct impulse that produces high-peak power.Can also carry out frequency multiplication (second harmonic generation) or frequency tripling (third harmonic generation) produces higher frequency to use in described equipment to telecommunication laser.The laser instrument of operable another kind of type is titanium sapphire laser device, its provide wavelength 650 and 1100nm between near shortwave, the high power pulse of (more typically, 800nm).Although these laser type are preferred, also can utilize the lasing light emitter of various other types.
Fig. 3 shows the example embodiment 52 of carrying out one dimension dispersive fourier-transform albedo measurement and the detection of database relevant matches.Should find out, except pattern maker 74 and amplitude modulator 76 are included for carrying out and being detected by coupling bar code 70 and the relevant matches of reference database, Fig. 3 is identical with Fig. 2.
The output of wideband pulse detecting laser 54 is conducted through optional pulse detector 56, optional optical amplifier 58, optional super continuous spectrums maker 60 and optional optical filter 62, by the optical circulator 64 of isolation incident and reflection wave, to for to the space dispersive diffraction grating 66 of this detection Shu Jinhang so that its wavelength dispersion to one dimension transverse line or extend pattern, to lens 68, to target bar code 70 or displacement sensing target or multiple target.From reflected light scioptics 68, the diffraction grating 66 of target bar code 70, and be routed to dispersive fourier-transform device 72 by optical circulator 64, to the amplitude modulator 76 also receiving from the signal of pattern maker 74.Be routed to detecting device 78 from the output of amplitude modulator 76, the output of detecting device 78 arrives digitizer 84 by optional filter 80 and optional amplifier 82 and is processed by signal processing apparatus 86.
Pattern maker 74 generating digital bar pattern (for example, it forms by 0 and 1), and be provided to amplitude modulator 76 with the form of conjugate time sequence.The bar pattern being generated by pattern maker 74 is counted as the database of the information of the self-contained article that read by described equipment about its bar code.Only in the time of the pattern match of the bar pattern being generated by pattern maker 74 and the bar code 70 reading, the transmission of amplitude modulator 76 by vacant be zero.Each pulse arrives after amplitude modulator, and the different pattern in database is provided for amplitude modulator, in database all with reference to bar code with test bar code and compare to check which mates with it.
Fig. 4 shows the example embodiment 88 of two-dimension chromatic dispersion type Fourier transform albedo measurement.Although Fig. 2 and Fig. 3 have described the schematic diagram for carrying out one dimension albedo measurement, thereby Fig. 4 shows for carrying out two-dimentional albedo measurement and reading the schematic diagram of two-dimensional bar code.
With reference to this accompanying drawing, the output of wideband pulse laser instrument 90 is conducted through optional pulse detector 92, optional optical amplifier 94, optional super continuous spectrums maker 96 and optional optical filter 98, by making the optical circulator 100 of incident and reflection wave isolation, to first lens 102, dispersor 104, the second lens 106 and diffraction grating 108, for example, to target 110 (two-dimensional bar code) or displacement sensing target or multiple target.Return by diffraction grating 108, lens 106, dispersor 104, lens 102 from the reflected light of target 110, and be routed to dispersive fourier-transform device 112 by optical circulator 100, to photodetector 114, the output of photodetector 114 has been arrived digitizer 120 by optional filter 116 and optional amplifier 118, and is processed by signal processing apparatus 122.
More specifically consider the element shown in Fig. 4, this embodiment preferably focuses on wideband pulse with cylindrical lens 102 phased array (VIPA) dispersor 104 of virtual image, for example comprise glass plate, on the proparea that described glass plate enters at light beam, there is antireflection film and on remaining front portion, there is highly-reflective coating (approximately 100%) and overleaf on there is part highly-reflective coating (being generally 95% or similar).VIPA dispersor 104 produces the beam array that each virtual image of beam waist of the back position of the first reflection is dispersed occurs from being positioned at incident beam.These light beam phase dry doublings form collimated light beam, then focus on by spherical lens 106.
Diffraction grating 108 segregates into the decline frequency of irradiating light beam along the direction of the dispersion direction producing perpendicular to VIPA dispersor 104.This has produced the light beam being made up of many points that focus on target sample 110 (or 2D bar code) in two dimensional surface.These on target sample 110 different frequency component corresponding to broad band light beam, has formed the resolvable spot on sample 110.Reflection from the different frequency component of the broad band light beam of sample 110 turns back to optical circulator 100 completely, forms the two-dimentional reflectivity of sample 110 by the pulse of optical spectrum encoded one-tenth.Input spectrum is mapped as time domain waveform by (amplifying type) dispersive fourier-transform 112.This dispersive fourier-transform 112 can be by optical amplifier, the light loss during processing with Compensation Transformation.Therefore, the output of (amplifying type) dispersive fourier-transform is to be similar to the time domain waveform of the optical spectrum encoded one-tenth of certain mode of raster scanning by the reflected light from two dimensional sample.
Fig. 5 shows the example embodiment 124 of two-dimension chromatic dispersion type Fourier transform albedo measurement and the detection of database relevant matches.According to this accompanying drawing, the two-dimentional reflected image obtaining has been converted into one dimension time domain waveform, then can be as shown in Figure 3 reading one-dimensional target time the same, detect with reference database and compare by carry out relevant matches with pattern maker 150 and amplitude modulator 152.
With reference to this accompanying drawing, the output of wideband pulse laser instrument 126 is conducted through optional pulse detector 128, optional optical amplifier 130, optional super continuous spectrums maker 132 and optional optical filter 134, (for example arrive first lens 138 by optical circulator 136, cylindrical lens), dispersor 140, the second lens 142 (for example, spherical lens) and diffraction grating 144, to target 146, for example two dimension (2D) bar code or displacement sensing target or multiple target.Return through diffraction grating 144, the second lens 142, dispersor 140, first lens 138 from the reflected light of target 146, and be routed to dispersion Fourier transform 148 by optical circulator 136.Receive the amplitude modulator 152 of the signal of inputting from pattern maker 150 from the directed sensing of output of Fourier transform 148.From the directed sensing photodetector 154 of output of amplitude modulator 152, the output of photodetector 154 arrives digitizer 160 to be processed by digital signal processor 162 by optional filter 156 and optional amplifier 158.
In the accompanying drawing (Figure 13) of explanation two-dimension chromatic dispersion type Fourier transform albedo measurement after a while, above-described embodiment is shown.Should again emphasize, sample can comprise any interested things that reads back, the two-dimensional bar code that for example unrestriced mode is described by example.
The actual test that the embodiment of the present invention is carried out is hereinafter discussed.
Fig. 6 shows the simple implementation 170 of the dispersive fourier-transform albedo measurement equipment shown in the Fig. 2 that uses the sample on piezoelectric transducer (PZT).Represent identical function with reference number identical shown in Fig. 2.Wideband pulse lasing light emitter 54 is couple to optical fiber 172, by optical circulator 64, arrives optical fiber collimator 176 by target side optical fiber 174.The directed sensing of free space beam 178 of exporting from collimating apparatus 176 produces the diffraction grating 34 of dispersion pattern 182, and scioptics 36 also arrive the sample 38 on the piezoelectricity translation stage 186 that is couple to fixed mount 188.As described about Fig. 2, reflected light returns and is separated to the measuring optical fiber 190 that uses dispersion compensating fiber (DCF) therefrom to carry out dispersive fourier-transform through this setting and by optical circulator 64.The unrestriced mode by example, DCF40 is shown in its input end to be had and is couple to optical fiber 194 for being attached to the first wave division multiplexer (WDM) 192 of the first pump source.The output of DCF40 is to be couple to optical fiber 198 for being attached to the Second Wave division multiplexer (WDM) 196 of the second pump source.The directed direct detection device 42 of output (being depicted as photodiode) of Fourier transform, and measurement mechanism 200 (being depicted as oscillograph herein) is pointed in guiding.Should be realized that, shown in test setting, oscillograph is provided for observing waveform, thereby evaluates whether can correctly record the waveform that described device generates by digital signal processing device and method.Should be expressly understood that, described oscillograph is used in the test of optical device, and in automation application, will utilize computer processor device to carry out analytic signal, thereby in response to the signal receiving from the remainder of equipment, target is read.
Light source 54 in this exemplary embodiment comprises that centre wavelength is that 1560nm, repetition rate are the locked mode femto second optical fiber laser that 100MHz and average output power are 20mW.Laser is by highly nonlinear optical fiber, and its bandwidth increases to 15nm.The repetition rate of laser is reduced to 25MHz by pulse detector (not illustrating in Fig. 6).After extra pulse detector and optical fibre circulator, the laser on optical fiber 174 has the average power of 5mW.Optical fiber collimator 176 makes the laser alignment in free space arrive diffraction grating 34, and described diffraction grating has the fringe density of 1200 row/millimeters and 90% reflection efficiency in this test case.The wavelength that diffraction grating is surveyed bundle by separation carries out spatial dispersion to broadband light.
Fig. 7 has described the target shown in Fig. 6 in the mode of example, and this example comprises silicon waveguide, has the silicon of being protected by silicon dioxide, and has adjacent thin aluminum film.It is wide that described aluminium membrane portions is illustrated as 80 μ m in this example, has the silicon fin of 5 μ m therebetween.Described silicon and silicon dioxide are transparent, and described aluminium film is that the light of about 1560nm is had to highly reflective.Use the target type of wide region and big or small inspection because the present invention stands, therefore only below allowing to understand, how relevant to the specific objective reading described measurement result be, in scope, to be only important to the measurement of above-mentioned target.
Fig. 8 has described to survey the spectrum of light and curve map from being used as the comparison between the spectrum of reflection detection light of catoptron of reference from the reflection of sample shown in Fig. 7.Scioptics are by space dispersive beam alignment sample, and described sample is the silicon waveguide shown in Fig. 7 in this example.As shown in Figure 6, it is upper that silicon waveguide sample is fixed on piezoelectric transducer (PZT), and described piezoelectric transducer is connected to the optics fixed mount with large quality.
As shown in Figure 6, the directed arrival sample 38 of pulse laser, and reflected light turns back to optical fiber collimator 176 by diffraction grating 34.Optical circulator guiding reflected light points to dispersion and is-dispersion compensating fiber (DCF) that 1512ps/nm and light loss are 9dB.Input spectrum is mapped as time domain waveform by described DCF, the horizontal reflectivity profile of optical spectrum encoded one dimension that described input spectrum is sample.Before DCF, wavelength division multiplexer (WDM) (WDM) is combined the Raman pumping of 1470nm with reflected light, after DCF, wavelength division multiplexer (WDM) (the 2nd WDM) removes the Raman pumping of 1470nm from reflected light.
Photoelectric detector (for example, having in this example the response time of 50ps) is used to the output of the time dispersion that detects DCF.According to by D.Yelin, I.Rizvi, W.M.White, J.T.Motz, T.Hasan, B.E.Bouma and G.J.Tearney at " Three-dimensional miniature endoscopy; " Nature443, given formula in 765 (2006), fringe density, centre wavelength, the bandwidth based on diffraction grating and survey the diameter of bundle and Littrow angle (Littrow ' s angle), resolvable spwort is about 64.Repetition rate (25MHz) based on laser, the temporal resolution of this dispersive fourier-transform imaging device is 40ns.
In Fig. 8, the catoptrical spectrum of dielectric mirror sample is shown as bell curve, and the spectrum of silicon waveguide is shown as curve below, and the middle part of this curve has " recess " or " sinking ".Wavelength shown in curve map is demarcated as the distance in X-axis.Relatively two spectrum, the spectrum of silicon waveguide clearly shows a sinking, and it is corresponding to the antiradar reflectivity part of sample (the silicon waveguide, being covered by silicon dioxide shown in Fig. 7).
Fig. 9 has described the demarcation reflectivity profile of sample shown in Fig. 7 according to measurement depicted in figure 8.Should be noted that a very obvious peak appears at approximately 40 μ m places.
Figure 10 has described another curve map of the demarcation reflectivity profile of sample shown in Fig. 7, its when using piezoelectricity translation stage transversal scanning sample in the measurement of not carrying out in the test setting shown in Fig. 6 in the same time.When scanning PZT with ramp function to make PZT in direction shown in Fig. 6 when translation sample, at four, (50 μ s and 75 μ s) do not show the demarcation reflectivity profile of tested sample for 0 μ s, 25 μ s in the same time.Silicon waveguide most of detection bundle, and detection bundle is reflected back light source by aluminium film.Although the Image Acquisition cycle is 40nm, herein for the sake of clarity, in every 625 scannings (every 25 μ s run-downs), only draw once.The fast offset of sample is clearly caught.
Figure 11 has described the reflection from sample shown in Fig. 7 different pump power levels, that have and do not have distributed raman amplification in Dispersion filter and has surveyed the spectrum of light.In the time that sample is weak reflecting body, weak reflected signal may be covered by the electronic noise of photoelectric detector.This brief description of the drawings, can improve signal to noise ratio (S/N ratio) by weak catoptrical power is carried out to optical amplifier.In this demonstration, distributed raman amplification is used to weak reflected signal to be promoted to far above detector noise.It is obvious that the signal of different pump powers in accompanying drawing (40mW, 80mW and 120mW) increases.
Figure 12 shows the example embodiment 210 of the bar code reading of dispersive fourier-transform shown in Fig. 2 taking equipment, except using different condenser lenses and described equipment being pointed to different target (being in particular bar code sample), this equipment is similar to equipment shown in Fig. 6.Condenser lens in Fig. 6 for example, is replaced by the spherical lens in Figure 11 (, having in this example the focal length of 100mm).Consider this example, beam spread is changed to the spot size increasing on diffraction grating.These improvement have caused the increase of resolvable spwort (145).Therefore in this example, bar code be used as sample demonstrate hypervelocity bar code read.
This simplification realize 210, dispersive fourier-transform albedo measurement equipment points to bar code sample.Use same reference numerals to represent identical function.Wideband pulse lasing light emitter 54 is coupled to optical fiber 172, by optical circulator 64, arrives optical fiber collimator 176 by target side wave filter 174.The free space beam 178 of exporting from collimating apparatus 176 points to the diffraction grating 34 that produces dispersion pattern 182, scioptics 212 directed sensing bar code 214.Reflected light returns through this setting, and is separated to by optical circulator 64 measuring optical fiber 190 that uses dispersion compensating fiber (DCF) to carry out dispersive fourier-transform.The unrestriced mode by example, DCF40 is illustrated in its input end to be had and is couple to optical fiber 194 for being attached to the first wave division multiplexer (WDM) 192 of the first pump source.The output of DCF40 is to be couple to optical fiber 198 for being attached to the Second Wave division multiplexer (WDM) 196 of the second pump source.The directed direct detection device 42 of output (being depicted as photodiode) of Fourier transform, and arrive measurement mechanism 200 (being depicted as oscillograph herein).Should be realized that, shown in test setting, oscillograph is provided for observing waveform, thereby evaluates whether can correctly record the waveform that described device generates by digital signal processing device and method.
Figure 13 has described the waveform response from testing apparatus shown in Figure 12, wherein by the background of sample bar code, the curve map that one-shot bar code is measured is shown.In this example, bar code sample is made up of the hyaline membrane that is printed on black bar on it.Accompanying drawing also uses the demarcation major axis on accompanying drawing to show the demarcation reflectivity profile of tested bar code.The reflectivity profile that measures easily compares (very consistent) with the bar code sample that shows 1001010100 in 17ns only.Scan rate is that 25MHz represents that single pass only needs 40ns.The feasibility that dispersive fourier-transform bar code reads has according to an embodiment of the invention been established in this demonstration clearly.
Figure 14 shows the example embodiment 250 of the two-dimension chromatic dispersion type Fourier transform albedo measurement shown in Fig. 4.In this simple implementation, dispersive fourier-transform albedo measurement equipment points to two-dimensional bar code or other samples.
Use same reference numerals to represent identical function.Wideband pulse lasing light emitter 54 is couple to optical fiber 172, by optical circulator 64, arrives optical fiber collimator 176 by target side optical fiber 174.The free space beam 178 of exporting from collimating apparatus 176 arrives phased array (VIPA) dispersor 254 of high-resolution virtual image by first lens 252 (being preferably cylindrical lens), the output 256 of dispersor 254 is irradiated to the 2D rainbow of sample 266 or irradiation (striking) diffraction grating 262 of dispersion pattern 264 by the second lens 258 (being preferably spherical lens), generation.Reflected light returns through this setting, and is separated to by optical circulator 64 measuring optical fiber 190 that uses dispersion compensating fiber (DCF) therefrom to carry out dispersive fourier-transform.The unrestriced mode by example, DCF40 is illustrated in its input end to be had and is couple to optical fiber 194 for being attached to the first wave division multiplexer (WDM) 192 of the first pump source.The output of DCF40 is to be couple to optical fiber 198 for being attached to the Second Wave division multiplexer (WDM) 196 of the second pump source.The directed direct detection device 42 of output (being depicted as photodiode) of Fourier transform, and arrive measurement mechanism 200 (being depicted as oscillograph herein).Should be realized that, shown in test setting, oscillograph is provided for observing waveform, thereby evaluates whether can correctly record the waveform that described device generates by digital signal processing device and method.The 1D time domain data detecting is digitally stored in the 2D matrix of the 2D image that represents sample.
Figure 15 shows the simple implementation 270 of dispersive fourier-transform transmissivity measurement equipment, although it reads transmitted light instead of reflected light by sample, it is similar to Fig. 6 and equipment shown in other.Should also be understood that and can be combined with reading catoptrical embodiment to reading of transmitted light, thereby reflected light and transmitted light can be recorded, so can be suitable for selecting the technology of application.Sample 38 is illustrated as sample and during analyzing, is retained, comprises or by its inner space.It should be understood that as in each other embodiment, sample can be surface, solid-state material, liquid state or gaseous material or its combination of coding.
Represent identical function with the same reference numerals shown in other accompanying drawings.Wideband pulse lasing light emitter 54 is couple to optical fiber 172, arrives optical fiber collimator 176.The free space beam 178 of exporting from collimating apparatus 176 points to the first diffraction grating 34a that produces dispersion pattern 182, by first lens 36a directed sensing sample 38.Transmission arrives the second diffraction grating 34b by the light of sample 38 by the second lens 36b, and arrives collimating apparatus 272 and use dispersion compensating fiber (DCF) 40 to carry out therein the measuring optical fiber 274 of dispersive fourier-transform.The unrestriced mode by example, DCF40 is illustrated in its input end to be had and is couple to optical fiber 194 for being attached to the first wave division multiplexer (WDM) 192 of the first pump source.The output of DCF40 is to be couple to optical fiber 198 for being attached to the Second Wave division multiplexer (WDM) 196 of the second pump source.The directed direct detection device 42 of output (being depicted as photodiode) of Fourier transform, and arriving signal treating apparatus 280.
Therefore, it should be understood that therefore transmission can be counted as catoptrical benefit conventionally by the light of sample because the light inciding on sample is reflected or is transmitted (unless it is absorbed, this only occurs in selection sample form).The modification arranging shown in Figure 15 also goes for interferometry, in interferometry, in response to the light receiving by the remainder of equipment, is detected the phase place of transparent substance by signal handling equipment.
Following part by example unrestriced mode summarized herein for multiple realization, pattern and feature described in the invention.The invention provides paired pulses and survey the method and apparatus that the one or more dimensions target of Shu Zhixiang reads.Inventive concept can be applicable in various device and application.Wherein, the present invention includes following inventive embodiments:
1. for an equipment for bar code reading and sensed displacement, comprising:
(a) survey for generating wideband pulse the device of restrainting;
(b) for the response light signal of the target based on reading, the spectrum Fourier transform of described pulse detection bundle is mapped to the device of the spatial domain of the target that sensing will read;
(c) for described response light signal being carried out to the device of dispersive fourier-transform, so that described response light signal is converted to time domain waveform; And
(d) for detection of with analyze the device of described time domain waveform, to determine the bar pattern and/or the displacement that are read in target.
2. equipment as described in example 1 above, wherein in response to reflexing to the luminous energy of the described device for dispersive fourier-transform from target or in response to producing described response light signal by object penetrating to the luminous energy of the described device for dispersive fourier-transform.
3. equipment as described in example 1 above, wherein propagates described detection bundle and described response light signal by free air, optical fiber or the combination by free air and optical fiber.
4. equipment as described in example 1 above, the wherein said device of surveying bundle for generating described wideband pulse comprises the laser instrument that is arranged to production burst.
5. equipment as described in example 1 above, also comprises that the pulse train for generating from the described device of surveying bundle for generating wideband pulse detects the device of selected pulse.
6. equipment as described in example 1 above, also comprise be couple to described for generate wideband pulse survey bundle device, for amplifying and/or the device of filtering, to improve signal to noise ratio (S/N ratio) and the detection sensitivity of described pulse detection bundle.
7. equipment as described in example 1 above, the wherein said device of surveying bundle for generating wideband pulse comprises the device generating for super continuous spectrums, broadens for the spectral bandwidth of the light that makes to send from light source.
8. equipment as described in example 1 above, wherein saidly comprises dispersion element for the device that spectrum Fourier transform is mapped to spatial domain.
9. equipment as described in example 1 above, wherein realizes the described device for Fourier transform mapping by the dispersion element that comprises diffraction grating, to separate the wavelength of described pulse detection bundle.
10. equipment as described in example 1 above, wherein realizes the described device for Fourier transform mapping by the dispersion element that comprises prism.
11. equipment as described in example 1 above, wherein realize the described device for Fourier transform mapping by the dispersion element of the phased array dispersor that comprises virtual image.
12. equipment as described in example 1 above, also comprise the device for separate targeted described pulse detection bundle according to the response light signal returning from target.
13. equipment as described in example 1 above, wherein comprise the element for causing group velocity dispersion (GVD) for the described device for dispersive fourier-transform that described response light signal is converted to time domain waveform.
14. equipment as described in example 1 above, the wherein said device for dispersive fourier-transform is included in the process that described response light signal is converted to time domain waveform and causes the dispersion element of group velocity dispersion (GVD) and/or the optical element of warbling.
15. equipment as described in example 1 above, wherein said for detection of comprising with the device of analyzing described time domain waveform:
(a) at least one light activated element;
(b) digitizer, it is couple to described light activated element, and described digitizer is arranged to optical waveform is converted to digital signal;
(c) digital signal processor, is arranged to and analyzes described digital signal, to read target.
16. equipment as described in example 1 above, before being also included in the described device for dispersive fourier-transform, within or optical amplifier and/or filtering afterwards.
17. equipment as described in example 1 above:
Before being also included in the described device for dispersive fourier-transform, within or optical amplifier and/or filtering afterwards; And
Wherein realize described optical amplifier with stimulated Raman scattering, semi-conductor amplifier or fiber amplifier.
18. equipment as described in example 1 above, also comprise:
Before being arranged in the described device for dispersive fourier-transform, within or fiber amplifier afterwards; And
Described fiber amplifier is carried out to the continuous glistening light of waves or the pulsed light of pumping.
19. equipment as described in example 1 above, also comprise for target is carried out to the device that optical data storehouse relevant matches detects.
20. equipment as described in example 1 above, also comprise:
Electrooptic modulator, before it is arranged in described response light signal is converted to electric signal; And
Database, it is couple to described for controlling the electrooptic modulator of optical modulation;
Wherein, receive the bar pattern of expectation from database and the conjugation that is applied to described electrooptic modulator thereof;
Wherein, whether there is relevant peaks and comes the relevant matches detection of realize target and database in response to detected response light signal.
21. equipment as described in example 1 above, wherein saidly comprise for carrying out the device that optical data storehouse is relevant:
(a) pattern maker, the information being arranged to based on from database generates relational pattern, should in goal set, find current goal;
(b) amplitude modulator, it is couple to described pattern maker, and described amplitude modulator is arranged to be modulated response light signal; And
(c) carry out the device of threshold value sensing for the response light signal to having carried out amplitude modulation(PAM), receive with indicating target and from database for modulating positive correlation or the negative correlation between the relational pattern of amplitude of described response light signal.
22. equipment as described in example 1 above, wherein said equipment is arranged to reading one-dimensional or two dimension target.
23. equipment as described in example 1 above, wherein said equipment is arranged to the target as the bar code using in the tracking of looking for automatic sorting in control, pipeline, PC media drive of the Serial Control of the tracking of commodity, printed circuit board (PCB), hdd unit or wafer manufacture is read.
24. equipment as described in example 1 above, the target that wherein said equipment is arranged to being selected from the application in application group reads, and described application group comprises tracking, tracking stem cell bank, sperm bank and/or the use in DNA sequence dna storehouse of bioinformatics, medical specimen.
25. equipment as described in example 1 above, wherein said equipment is arranged in the process of target being carried out to high-speed displacement sensing and reads target.
26. equipment as described in example 1 above:
Wherein said equipment is arranged in the process of target being carried out to high-speed displacement sensing and reads target; And
Wherein high-speed displacement sensing comprises the measurement to rough surface and/or the measurement to width and gap.
27. equipment as described in example 1 above, wherein said equipment is arranged to by detecting and/or measure the endocorpuscular movement of fluid and realizes flow cytometry.
28. equipment as described in example 1 above, wherein said equipment is arranged in response to the reflection differences of encoding in optical storage media target is read.
29. equipment as described in example 1 above:
Wherein, the target that described equipment is arranged to comprising the reflection differences of encoding in optical storage media reads; And
Wherein, format described optical storage media according to the storage protocol of the expectation of selecting from the protocol groups of be used for encoding CD, DVD and Blu-ray Disc.
30. equipment as described in example 1 above, wherein said equipment is arranged to and detects object and exist or do not exist.
31. 1 kinds of equipment, comprising:
(a) wideband light source, is arranged to production burst and surveys bundle;
(b) optical spectrum encoded device, is arranged to the target that described pulse detection bundle is transformed into spatial domain and guides its sensing to read;
(c) spatial decoder, is arranged to the spatial domain light from target reflection or transmission is transformed into time domain through the spatial domain light of target; And
(d) signal processor, is arranged to time domain waveform described in determination and analysis, to read pattern and/or definite displacement in target.
32. 1 kinds for reading the method for the pattern of target and the displacement of definite target, comprising:
(a) survey bundle from wideband light source production burst;
(b) described pulse detection bundle is transformed into spatial domain;
(c) target that guides described spatial domain pulse detection Shu Zhixiang to read;
(d) will be converted to time domain waveform from the spatial domain light that is read target; And
(e) detect and analyze described time domain waveform being configured in the processor of carrying out from the programmed instruction of storer, to read pattern and/or definite displacement in target.
Although more than describe and comprise many details, these are not appreciated that limitation of the scope of the invention, and are only to provide the explanation to currently preferred embodiments more of the present invention.Therefore, it should be understood that, scope of the present invention contains other embodiment that it will be apparent to those skilled in the art completely, and therefore scope of the present invention is only defined by the following claims, in claims, unless expressly stated, otherwise the element of the singulative of mentioning do not refer to " only having one " and refer to " one or more ".In all structures known to persons of ordinary skill in the art, chemically and the element that is equivalent to above preferred embodiment in function all mode be by reference incorporated into clearly this and contained by claims.In addition the device that, claims contain or method are without solving each problem to be solved by this invention.In addition, in the disclosure, do not have element, parts or method step to be intended to be exclusively used in the public, and no matter whether this element, parts or method step are explicitly recited in claim.

Claims (29)

1. for an equipment for bar code reading and sensed displacement, comprising:
Survey the device of bundle for generating wideband pulse;
The spectrum Fourier transform of described pulse detection bundle is mapped to spatial domain and the device of target that spatial domain pulse detection Shu Zhixiang will be read for the response light signal of target based on reading;
For described response light signal is carried out to dispersive fourier-transform described response light signal is converted to the device of time domain waveform; And
For detection of with analyze described time domain waveform to determine the bar pattern that is read in target and/or the device of displacement,
Wherein for being carried out to dispersive fourier-transform, described response light signal comprises the element for causing group velocity dispersion (GVD) with the device that described response light signal is converted to time domain waveform.
2. equipment as described in claim 1, wherein in response to reflexing to the luminous energy of the described device for dispersive fourier-transform from target or in response to producing described response light signal by object penetrating to the luminous energy of the described device for dispersive fourier-transform.
3. equipment as described in claim 1, wherein propagates described detection bundle and described response light signal by free air, optical fiber or the combination by free air and optical fiber.
4. equipment as described in claim 1, the wherein said device of surveying bundle for generating described wideband pulse comprises the laser instrument that is arranged to production burst.
5. equipment as described in claim 1, also comprises that the pulse train for generating from the described device of surveying bundle for generating wideband pulse detects the device of selected pulse.
6. equipment as described in claim 1, also comprise be couple to described for generate wideband pulse survey bundle device, for amplifying and/or the device of filtering, to improve signal to noise ratio (S/N ratio) and the detection sensitivity of described pulse detection bundle.
7. equipment as described in claim 1, the wherein said device of surveying bundle for generating wideband pulse comprises the device generating for super continuous spectrums, broadens for the spectral bandwidth of the light that makes to send from light source.
8. equipment as described in claim 1, wherein saidly comprises dispersion element for the device that spectrum Fourier transform is mapped to spatial domain.
9. equipment as described in claim 1, wherein realizes the described device for Fourier transform mapping by the dispersion element that comprises diffraction grating, to separate the wavelength of described pulse detection bundle.
10. equipment as described in claim 1, wherein realizes the described device for Fourier transform mapping by the dispersion element that comprises prism.
11. equipment as described in claim 1, wherein realize the described device for Fourier transform mapping by the dispersion element of the phased array dispersor that comprises virtual image.
12. equipment as described in claim 1, also comprise the device for separate targeted described pulse detection bundle according to the response light signal returning from target.
13. equipment as described in claim 1, the wherein said device for dispersive fourier-transform is included in the process that described response light signal is converted to time domain waveform and causes the dispersion element of group velocity dispersion (GVD) and/or the optical element of warbling.
14. equipment as described in claim 1, wherein said for detection of comprising with the device of analyzing described time domain waveform:
At least one light activated element;
Digitizer, it is couple to described light activated element, and described digitizer is arranged to optical waveform is converted to digital signal;
Digital signal processor, is arranged to and analyzes described digital signal, to read target.
15. equipment as described in claim 1, before being also included in the described device for dispersive fourier-transform, within or optical amplifier and/or filtering afterwards.
16. equipment as described in claim 1:
Before being also included in the described device for dispersive fourier-transform, within or optical amplifier and/or filtering afterwards; And
Wherein realize described optical amplifier with stimulated Raman scattering, semi-conductor amplifier or fiber amplifier.
17. equipment as described in claim 1, also comprise:
Before being arranged in the described device for dispersive fourier-transform, within or fiber amplifier afterwards; And
Described fiber amplifier is carried out to the continuous glistening light of waves or the pulsed light of pumping.
18. equipment as described in claim 1, also comprise for target is carried out to the device that optical data storehouse relevant matches detects.
19. equipment as described in claim 1, also comprise:
Electrooptic modulator, before it is arranged in described response light signal is converted to electric signal; And
Database, it is couple to described for controlling the electrooptic modulator of optical modulation;
Wherein, receive the bar pattern of expectation from database and the conjugation that is applied to described electrooptic modulator thereof;
Wherein, whether there is relevant peaks and comes the relevant matches detection of realize target and database in response to detected response light signal.
20. equipment as described in claim 1, wherein saidly comprise for carrying out the device that optical data storehouse is relevant:
Pattern maker, the information being arranged to based on from database generates relational pattern, should in goal set, find current goal;
Amplitude modulator, it is couple to described pattern maker, and described amplitude modulator is arranged to be modulated response light signal; And
For carry out the device of threshold value sensing to having carried out the response light signal of amplitude modulation(PAM), receive with indicating target and from database for modulating positive correlation or the negative correlation between the relational pattern of amplitude of described response light signal.
21. equipment as described in claim 1, wherein said equipment is arranged to reading one-dimensional or two dimension target.
22. equipment as described in claim 1, wherein said equipment is arranged to the target as the bar code using in the tracking of looking for automatic sorting in control, pipeline, PC media drive of the Serial Control of the tracking of commodity, printed circuit board (PCB), hdd unit or wafer manufacture is read.
23. equipment as described in claim 1, the target that wherein said equipment is arranged to being selected from the application in application group reads, and described application group comprises tracking, tracking stem cell bank, sperm bank and/or the use in DNA sequence dna storehouse of bioinformatics, medical specimen.
24. equipment as described in claim 1, wherein said equipment is arranged in the process of target being carried out to high-speed displacement sensing and reads target.
25. equipment as described in claim 1:
Wherein said equipment is arranged in the process of target being carried out to high-speed displacement sensing and reads target; And
Wherein high-speed displacement sensing comprises the measurement to rough surface and/or the measurement to width and gap.
26. equipment as described in claim 1, wherein said equipment is arranged to by detecting and/or measure the endocorpuscular movement of fluid and morphological feature and realizes flow cytometry.
27. equipment as described in claim 1, wherein said equipment is arranged in response to the reflection differences of encoding in optical storage media target is read.
28. equipment as described in claim 1:
Wherein, the target that described equipment is arranged to comprising the reflection differences of encoding in optical storage media reads; And
Wherein, format described optical storage media according to the storage protocol of the expectation of selecting from the protocol groups of be used for encoding CD, DVD and Blu-ray Disc.
29. equipment as described in claim 1, wherein said equipment is arranged to object and exists or non-existent detection.
CN200980131718.1A 2008-07-24 2009-07-23 Apparatus and method for dispersive fourier-transform imaging Expired - Fee Related CN102239494B (en)

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IL210649A0 (en) 2011-03-31
WO2010011875A3 (en) 2010-04-08
IL210649A (en) 2015-06-30
ES2537333T3 (en) 2015-06-05
AU2009273954B2 (en) 2015-07-02
JP2011529230A (en) 2011-12-01
JP5508416B2 (en) 2014-05-28
EP2321766A2 (en) 2011-05-18
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US8376218B2 (en) 2013-02-19

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